Undefined index: primary in … functions.php

Hi,

after I modified the jumbo headline in the customizer of the theme the sidebar got pushed into the footer and I get the following notices:

Notice: Undefined index: primary in /home/blabla/www/wp-content/themes/arcade-basic/functions.php on line 30

Notice: Undefined index: in /home/blabla/www/wp-content/themes/arcade-basic/functions.php on line 30

Notice: Undefined index: width in /home/blabla/www/wp-content/themes/arcade-basic/functions.php on line 30

Notice: Undefined index: arc in /home/blabla/www/wp-content/themes/arcade-basic/library/customizer.php on line 120

Notice: Undefined index: fittext in /home/blabla/www/wp-content/themes/arcade-basic/library/customizer.php on line 134

Notice: Undefined index: header_icon in /home/blabla/www/wp-content/themes/arcade-basic/library/customizer.php on line 148

Notice: Undefined index: width in /home/blabla/www/wp-content/themes/arcade-basic/library/customizer.php on line 167

Notice: Undefined index: primary in /home/blabla/www/wp-content/themes/arcade-basic/library/customizer.php on line 199

Notice: Undefined index: display_categories in /home/blabla/www/wp-content/themes/arcade-basic/library/customizer.php on line 289

Notice: Undefined index: display_author in /home/blabla/www/wp-content/themes/arcade-basic/library/customizer.php on line 303

Notice: Undefined index: display_date in /home/blabla/www/wp-content/themes/arcade-basic/library/customizer.php on line 317

Notice: Undefined index: display_comment_count in /home/blabla/www/wp-content/themes/arcade-basic/library/customizer.php on line 331

Can anyone help me out why my primary content amongst others is not defined anymore?

Thanks for any help!
Tobi